/*
* Copyright (c) 2006-2009, Salvatore Sanfilippo <antirez at gmail dot com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Redis nor the names of its contributors may be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#define REDIS_VERSION "0.08"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <signal.h>
#include <sys/wait.h>
#include <errno.h>
#include <assert.h>
#include <ctype.h>
#include <stdarg.h>
#include <inttypes.h>
#include <arpa/inet.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <limits.h>
#include "ae.h" /* Event driven programming library */
#include "sds.h" /* Dynamic safe strings */
#include "anet.h" /* Networking the easy way */
#include "dict.h" /* Hash tables */
#include "adlist.h" /* Linked lists */
#include "zmalloc.h" /* total memory usage aware version of malloc/free */
/* Error codes */
#define REDIS_OK 0
#define REDIS_ERR -1
/* Static server configuration */
#define REDIS_SERVERPORT 6379 /* TCP port */
#define REDIS_MAXIDLETIME (60*5) /* default client timeout */
#define REDIS_QUERYBUF_LEN 1024
#define REDIS_LOADBUF_LEN 1024
#define REDIS_MAX_ARGS 16
#define REDIS_DEFAULT_DBNUM 16
#define REDIS_CONFIGLINE_MAX 1024
#define REDIS_OBJFREELIST_MAX 1000000 /* Max number of objects to cache */
#define REDIS_MAX_SYNC_TIME 60 /* Slave can't take more to sync */
/* Hash table parameters */
#define REDIS_HT_MINFILL 10 /* Minimal hash table fill 10% */
#define REDIS_HT_MINSLOTS 16384 /* Never resize the HT under this */
/* Command flags */
#define REDIS_CMD_BULK 1
#define REDIS_CMD_INLINE 2
/* Object types */
#define REDIS_STRING 0
#define REDIS_LIST 1
#define REDIS_SET 2
#define REDIS_HASH 3
/* Object types only used for dumping to disk */
#define REDIS_SELECTDB 254
#define REDIS_EOF 255
/* Defines related to the dump file format. To store 32 bits lengths for short
* keys requires a lot of space, so we check the most significant 2 bits of
* the first byte to interpreter the length:
*
* 00|000000 => if the two MSB are 00 the len is the 6 bits of this byte
* 01|000000 00000000 => 01, the len is 14 byes, 6 bits + 8 bits of next byte
* 10|000000 [32 bit integer] => if it's 01, a full 32 bit len will follow
* 11|000000 this means: specially encoded object will follow. The six bits
* number specify the kind of object that follows.
* See the REDIS_RDB_ENC_* defines.
*
* Lenghts up to 63 are stored using a single byte, most DB keys, and may
* values, will fit inside. */
#define REDIS_RDB_6BITLEN 0
#define REDIS_RDB_14BITLEN 1
#define REDIS_RDB_32BITLEN 2
#define REDIS_RDB_ENCVAL 3
#define REDIS_RDB_LENERR UINT_MAX
/* When a length of a string object stored on disk has the first two bits
* set, the remaining two bits specify a special encoding for the object
* accordingly to the following defines: */
#define REDIS_RDB_ENC_INT8 0 /* 8 bit signed integer */
#define REDIS_RDB_ENC_INT16 1 /* 16 bit signed integer */
#define REDIS_RDB_ENC_INT32 2 /* 32 bit signed integer */
#define REDIS_RDB_ENC_FLZ 3 /* string compressed with FASTLZ */
/* Client flags */
#define REDIS_CLOSE 1 /* This client connection should be closed ASAP */
#define REDIS_SLAVE 2 /* This client is a slave server */
#define REDIS_MASTER 4 /* This client is a master server */
#define REDIS_MONITOR 8 /* This client is a slave monitor, see MONITOR */
/* Server replication state */
#define REDIS_REPL_NONE 0 /* No active replication */
#define REDIS_REPL_CONNECT 1 /* Must connect to master */
#define REDIS_REPL_CONNECTED 2 /* Connected to master */
/* List related stuff */
#define REDIS_HEAD 0
#define REDIS_TAIL 1
/* Sort operations */
#define REDIS_SORT_GET 0
#define REDIS_SORT_DEL 1
#define REDIS_SORT_INCR 2
#define REDIS_SORT_DECR 3
#define REDIS_SORT_ASC 4
#define REDIS_SORT_DESC 5
#define REDIS_SORTKEY_MAX 1024
/* Log levels */
#define REDIS_DEBUG 0
#define REDIS_NOTICE 1
#define REDIS_WARNING 2
/* Anti-warning macro... */
#define REDIS_NOTUSED(V) ((void) V)
/*================================= Data types ============================== */
/* A redis object, that is a type able to hold a string / list / set */
typedef struct redisObject {
int type;
void *ptr;
int refcount;
} robj;
/* With multiplexing we need to take per-clinet state.
* Clients are taken in a liked list. */
typedef struct redisClient {
int fd;
dict *dict;
int dictid;
sds querybuf;
robj *argv[REDIS_MAX_ARGS];
int argc;
int bulklen; /* bulk read len. -1 if not in bulk read mode */
list *reply;
int sentlen;
time_t lastinteraction; /* time of the last interaction, used for timeout */
int flags; /* REDIS_CLOSE | REDIS_SLAVE | REDIS_MONITOR */
int slaveseldb; /* slave selected db, if this client is a slave */
int authenticated; /* when requirepass is non-NULL */
} redisClient;
struct saveparam {
time_t seconds;
int changes;
};
/* Global server state structure */
struct redisServer {
int port;
int fd;
dict **dict;
dict *sharingpool;
unsigned int sharingpoolsize;
long long dirty; /* changes to DB from the last save */
list *clients;
list *slaves, *monitors;
char neterr[ANET_ERR_LEN];
aeEventLoop *el;
int cronloops; /* number of times the cron function run */
list *objfreelist; /* A list of freed objects to avoid malloc() */
time_t lastsave; /* Unix time of last save succeeede */
int usedmemory; /* Used memory in megabytes */
/* Fields used only for stats */
time_t stat_starttime; /* server start time */
long long stat_numcommands; /* number of processed commands */
long long stat_numconnections; /* number of connections received */
/* Configuration */
int verbosity;
int glueoutputbuf;
int maxidletime;
int dbnum;
int daemonize;
char *pidfile;
int bgsaveinprogress;
struct saveparam *saveparams;
int saveparamslen;
char *logfile;
char *bindaddr;
char *dbfilename;
char *requirepass;
int shareobjects;
/* Replication related */
int isslave;
char *masterhost;
int masterport;
redisClient *master;
int replstate;
/* Sort parameters - qsort_r() is only available under BSD so we
* have to take this state global, in order to pass it to sortCompare() */
int sort_desc;
int sort_alpha;
int sort_bypattern;
};
typedef void redisCommandProc(redisClient *c);
struct redisCommand {
char *name;
redisCommandProc *proc;
int arity;
int flags;
};
typedef struct _redisSortObject {
robj *obj;
union {
double score;
robj *cmpobj;
} u;
} redisSortObject;
typedef struct _redisSortOperation {
int type;
robj *pattern;
} redisSortOperation;
struct sharedObjectsStruct {
robj *crlf, *ok, *err, *emptybulk, *czero, *cone, *pong, *space,
*colon, *nullbulk, *nullmultibulk,
*emptymultibulk, *wrongtypeerr, *nokeyerr, *syntaxerr, *sameobjecterr,
*outofrangeerr, *plus,
*select0, *select1, *select2, *select3, *select4,
*select5, *select6, *select7, *select8, *select9;
} shared;
/*================================ Prototypes =============================== */
static void freeStringObject(robj *o);
static void freeListObject(robj *o);
static void freeSetObject(robj *o);
static void decrRefCount(void *o);
static robj *createObject(int type, void *ptr);
static void freeClient(redisClient *c);
static int rdbLoad(char *filename);
static void addReply(redisClient *c, robj *obj);
static void addReplySds(redisClient *c, sds s);
static void incrRefCount(robj *o);
static int rdbSaveBackground(char *filename);
static robj *createStringObject(char *ptr, size_t len);
static void replicationFeedSlaves(list *slaves, struct redisCommand *cmd, int dictid, robj **argv, int argc);
static int syncWithMaster(void);
static robj *tryObjectSharing(robj *o);
static void authCommand(redisClient *c);
static void pingCommand(redisClient *c);
static void echoCommand(redisClient *c);
static void setCommand(redisClient *c);
static void setnxCommand(redisClient *c);
static void getCommand(redisClient *c);
static void delCommand(redisClient *c);
static void existsCommand(redisClient *c);
static void incrCommand(redisClient *c);
static void decrCommand(redisClient *c);
static void incrbyCommand(redisClient *c);
static void decrbyCommand(redisClient *c);
static void selectCommand(redisClient *c);
static void randomkeyCommand(redisClient *c);
static void keysCommand(redisClient *c);
static void dbsizeCommand(redisClient *c);
static void lastsaveCommand(redisClient *c);
static void saveCommand(redisClient *c);
static void bgsaveCommand(redisClient *c);
static void shutdownCommand(redisClient *c);
static void moveCommand(redisClient *c);
static void renameCommand(redisClient *c);
static void renamenxCommand(redisClient *c);
static void lpushCommand(redisClient *c);
static void rpushCommand(redisClient *c);
static void lpopCommand(redisClient *c);
static void rpopCommand(redisClient *c);
static void llenCommand(redisClient *c);
static void lindexCommand(redisClient *c);
static void lrangeCommand(redisClient *c);
static void ltrimCommand(redisClient *c);
static void typeCommand(redisClient *c);
static void lsetCommand(redisClient *c);
static void saddCommand(redisClient *c);
static void sremCommand(redisClient *c);
static void sismemberCommand(redisClient *c);
static void scardCommand(redisClient *c);
static void sinterCommand(redisClient *c);
static void sinterstoreCommand(redisClient *c);
static void syncCommand(redisClient *c);
static void flushdbCommand(redisClient *c);
static void flushallCommand(redisClient *c);
static void sortCommand(redisClient *c);
static void lremCommand(redisClient *c);
static void infoCommand(redisClient *c);
static void mgetCommand(redisClient *c);
static void monitorCommand(redisClient *c);
/*================================= Globals ================================= */
/* Global vars */
static struct redisServer server; /* server global state */
static struct redisCommand cmdTable[] = {
{"get",getCommand,2,REDIS_CMD_INLINE},
{"set",setCommand,3,REDIS_CMD_BULK},
{"setnx",setnxCommand,3,REDIS_CMD_BULK},
{"del",delCommand,2,REDIS_CMD_INLINE},
{"exists",existsCommand,2,REDIS_CMD_INLINE},
{"incr",incrCommand,2,REDIS_CMD_INLINE},
{"decr",decrCommand,2,REDIS_CMD_INLINE},
{"mget",mgetCommand,-2,REDIS_CMD_INLINE},
{"rpush",rpushCommand,3,REDIS_CMD_BULK},
{"lpush",lpushCommand,3,REDIS_CMD_BULK},
{"rpop",rpopCommand,2,REDIS_CMD_INLINE},
{"lpop",lpopCommand,2,REDIS_CMD_INLINE},
{"llen",llenCommand,2,REDIS_CMD_INLINE},
{"lindex",lindexCommand,3,REDIS_CMD_INLINE},
{"lset",lsetCommand,4,REDIS_CMD_BULK},
{"lrange",lrangeCommand,4,REDIS_CMD_INLINE},
{"ltrim",ltrimCommand,4,REDIS_CMD_INLINE},
{"lrem",lremCommand,4,REDIS_CMD_BULK},
{"sadd",saddCommand,3,REDIS_CMD_BULK},
{"srem",sremCommand,3,REDIS_CMD_BULK},
{"sismember",sismemberCommand,3,REDIS_CMD_BULK},
{"scard",scardCommand,2,REDIS_CMD_INLINE},
{"sinter",sinterCommand,-2,REDIS_CMD_INLINE},
{"sinterstore",sinterstoreCommand,-3,REDIS_CMD_INLINE},
{"smembers",sinterCommand,2,REDIS_CMD_INLINE},
{"incrby",incrbyCommand,3,REDIS_CMD_INLINE},
{"decrby",decrbyCommand,3,REDIS_CMD_INLINE},
{"randomkey",randomkeyCommand,1,REDIS_CMD_INLINE},
{"select",selectCommand,2,REDIS_CMD_INLINE},
{"move",moveCommand,3,REDIS_CMD_INLINE},
{"rename",renameCommand,3,REDIS_CMD_INLINE},
{"renamenx",renamenxCommand,3,REDIS_CMD_INLINE},
{"keys",keysCommand,2,REDIS_CMD_INLINE},
{"dbsize",dbsizeCommand,1,REDIS_CMD_INLINE},
{"auth",authCommand,2,REDIS_CMD_INLINE},
{"ping",pingCommand,1,REDIS_CMD_INLINE},
{"echo",echoCommand,2,REDIS_CMD_BULK},
{"save",saveCommand,1,REDIS_CMD_INLINE},
{"bgsave",bgsaveCommand,1,REDIS_CMD_INLINE},
{"shutdown",shutdownCommand,1,REDIS_CMD_INLINE},
{"lastsave",lastsaveCommand,1,REDIS_CMD_INLINE},
{"type",typeCommand,2,REDIS_CMD_INLINE},
{"sync",syncCommand,1,REDIS_CMD_INLINE},
{"flushdb",flushdbCommand,1,REDIS_CMD_INLINE},
{"flushall",flushallCommand,1,REDIS_CMD_INLINE},
{"sort",sortCommand,-2,REDIS_CMD_INLINE},
{"info",infoCommand,1,REDIS_CMD_INLINE},
{"monitor",monitorCommand,1,REDIS_CMD_INLINE},
{NULL,NULL,0,0}
};
/*============================ Utility functions ============================ */
/* Glob-style pattern matching. */
int stringmatchlen(const char *pattern, int patternLen,
const char *string, int stringLen, int nocase)
{
while(patternLen) {
switch(pattern[0]) {
case '*':
while (pattern[1] == '*') {
pattern++;
patternLen--;
}
if (patternLen == 1)
return 1; /* match */
while(stringLen) {
if (stringmatchlen(pattern+1, patternLen-1,
string, stringLen, nocase))
return 1; /* match */
string++;
stringLen--;
}
return 0; /* no match */
break;
case '?':
if (stringLen == 0)
return 0; /* no match */
string++;
stringLen--;
break;
case '[':
{
int not, match;
pattern++;
patternLen--;
not = pattern[0] == '^';
if (not) {
pattern++;
patternLen--;
}
match = 0;
while(1) {
if (pattern[0] == '\\') {
pattern++;
patternLen--;
if (pattern[0] == string[0])
match = 1;
} else if (pattern[0] == ']') {
break;
} else if (patternLen == 0) {
pattern--;
patternLen++;
break;
} else if (pattern[1] == '-' && patternLen >= 3) {
int start = pattern[0];
int end = pattern[2];
int c = string[0];
if (start > end) {
int t = start;
start = end;
end = t;
}
if (nocase) {
start = tolower(start);
end = tolower(end);
c = tolower(c);
}
pattern += 2;
patternLen -= 2;
if (c >= start && c <= end)
match = 1;
} else {
if (!nocase) {
if (pattern[0] == string[0])
match = 1;
} else {
if (tolower((int)pattern[0]) == tolower((int)string[0]))
match = 1;
}
}
pattern++;
patternLen--;
}
if (not)
match = !match;
if (!match)
return 0; /* no match */
string++;
stringLen--;
break;
}
case '\\':
if (patternLen >= 2) {
pattern++;
patternLen--;
}
/* fall through */
default:
if (!nocase) {
if (pattern[0] != string[0])
return 0; /* no match */
} else {
if (tolower((int)pattern[0]) != tolower((int)string[0]))
return 0; /* no match */
}
string++;
stringLen--;
break;
}
pattern++;
patternLen--;
if (stringLen == 0) {
while(*pattern == '*') {
pattern++;
patternLen--;
}
break;
}
}
if (patternLen == 0 && stringLen == 0)
return 1;
return 0;
}
void redisLog(int level, const char *fmt, ...)
{
va_list ap;
FILE *fp;
fp = (server.logfile == NULL) ? stdout : fopen(server.logfile,"a");
if (!fp) return;
va_start(ap, fmt);
if (level >= server.verbosity) {
char *c = ".-*";
fprintf(fp,"%c ",c[level]);
vfprintf(fp, fmt, ap);
fprintf(fp,"\n");
fflush(fp);
}
va_end(ap);
if (server.logfile) fclose(fp);
}
/*====================== Hash table type implementation ==================== */
/* This is an hash table type that uses the SDS dynamic strings libary as
* keys and radis objects as values (objects can hold SDS strings,
* lists, sets). */
static int sdsDictKeyCompare(void *privdata, const void *key1,
const void *key2)
{
int l1,l2;
DICT_NOTUSED(privdata);
l1 = sdslen((sds)key1);
l2 = sdslen((sds)key2);
if (l1 != l2) return 0;
return memcmp(key1, key2, l1) == 0;
}
static void dictRedisObjectDestructor(void *privdata, void *val)
{
DICT_NOTUSED(privdata);
decrRefCount(val);
}
static int dictSdsKeyCompare(void *privdata, const void *key1,
const void *key2)
{
const robj *o1 = key1, *o2 = key2;
return sdsDictKeyCompare(privdata,o1->ptr,o2->ptr);
}
static unsigned int dictSdsHash(const void *key) {
const robj *o = key;
return dictGenHashFunction(o->ptr, sdslen((sds)o->ptr));
}
static dictType setDictType = {
dictSdsHash, /* hash function */
NULL, /* key dup */
NULL, /* val dup */
dictSdsKeyCompare, /* key compare */
dictRedisObjectDestructor, /* key destructor */
NULL /* val destructor */
};
static dictType hashDictType = {
dictSdsHash, /* hash function */
NULL, /* key dup */
NULL, /* val dup */
dictSdsKeyCompare, /* key compare */
dictRedisObjectDestructor, /* key destructor */
dictRedisObjectDestructor /* val destructor */
};
/* ========================= Random utility functions ======================= */
/* Redis generally does not try to recover from out of memory conditions
* when allocating objects or strings, it is not clear if it will be possible
* to report this condition to the client since the networking layer itself
* is based on heap allocation for send buffers, so we simply abort.
* At least the code will be simpler to read... */
static void oom(const char *msg) {
fprintf(stderr, "%s: Out of memory\n",msg);
fflush(stderr);
sleep(1);
abort();
}
/* ====================== Redis server networking stuff ===================== */
void closeTimedoutClients(void) {
redisClient *c;
listIter *li;
listNode *ln;
time_t now = time(NULL);
li = listGetIterator(server.clients,AL_START_HEAD);
if (!li) return;
while ((ln = listNextElement(li)) != NULL) {
c = listNodeValue(ln);
if (!(c->flags & REDIS_SLAVE) && /* no timeout for slaves */
(now - c->lastinteraction > server.maxidletime)) {
redisLog(REDIS_DEBUG,"Closing idle client");
freeClient(c);
}
}
listReleaseIterator(li);
}
int serverCron(struct aeEventLoop *eventLoop, long long id, void *clientData) {
int j, size, used, loops = server.cronloops++;
REDIS_NOTUSED(eventLoop);
REDIS_NOTUSED(id);
REDIS_NOTUSED(clientData);
/* Update the global state with the amount of used memory */
server.usedmemory = zmalloc_used_memory();
/* If the percentage of used slots in the HT reaches REDIS_HT_MINFILL
* we resize the hash table to save memory */
for (j = 0; j < server.dbnum; j++) {
size = dictGetHashTableSize(server.dict[j]);
used = dictGetHashTableUsed(server.dict[j]);
if (!(loops % 5) && used > 0) {
redisLog(REDIS_DEBUG,"DB %d: %d keys in %d slots HT.",j,used,size);
/* dictPrintStats(server.dict); */
}
if (size && used && size > REDIS_HT_MINSLOTS &&
(used*100/size < REDIS_HT_MINFILL)) {
redisLog(REDIS_NOTICE,"The hash table %d is too sparse, resize it...",j);
dictResize(server.dict[j]);
redisLog(REDIS_NOTICE,"Hash table %d resized.",j);
}
}
/* Show information about connected clients */
if (!(loops % 5)) {
redisLog(REDIS_DEBUG,"%d clients connected (%d slaves), %d bytes in use",
listLength(server.clients)-listLength(server.slaves),
listLength(server.slaves),
server.usedmemory,
dictGetHashTableUsed(server.sharingpool));
}
/* Close connections of timedout clients */
if (!(loops % 10))
closeTimedoutClients();
/* Check if a background saving in progress terminated */
if (server.bgsaveinprogress) {
int statloc;
if (wait4(-1,&statloc,WNOHANG,NULL)) {
int exitcode = WEXITSTATUS(statloc);
if (exitcode == 0) {
redisLog(REDIS_NOTICE,
"Background saving terminated with success");
server.dirty = 0;
server.lastsave = time(NULL);
} else {
redisLog(REDIS_WARNING,
"Background saving error");
}
server.bgsaveinprogress = 0;
}
} else {
/* If there is not a background saving in progress check if
* we have to save now */
time_t now = time(NULL);
for (j = 0; j < server.saveparamslen; j++) {
struct saveparam *sp = server.saveparams+j;
if (server.dirty >= sp->changes &&
now-server.lastsave > sp->seconds) {
redisLog(REDIS_NOTICE,"%d changes in %d seconds. Saving...",
sp->changes, sp->seconds);
rdbSaveBackground(server.dbfilename);
break;
}
}
}
/* Check if we should connect to a MASTER */
if (server.replstate == REDIS_REPL_CONNECT) {
redisLog(REDIS_NOTICE,"Connecting to MASTER...");
if (syncWithMaster() == REDIS_OK) {
redisLog(REDIS_NOTICE,"MASTER <-> SLAVE sync succeeded");
}
}
return 1000;
}
static void createSharedObjects(void) {
shared.crlf = createObject(REDIS_STRING,sdsnew("\r\n"));
shared.ok = createObject(REDIS_STRING,sdsnew("+OK\r\n"));
shared.err = createObject(REDIS_STRING,sdsnew("-ERR\r\n"));
shared.emptybulk = createObject(REDIS_STRING,sdsnew("$0\r\n\r\n"));
shared.czero = createObject(REDIS_STRING,sdsnew(":0\r\n"));
shared.cone = createObject(REDIS_STRING,sdsnew(":1\r\n"));
shared.nullbulk = createObject(REDIS_STRING,sdsnew("$-1\r\n"));
shared.nullmultibulk = createObject(REDIS_STRING,sdsnew("*-1\r\n"));
shared.emptymultibulk = createObject(REDIS_STRING,sdsnew("*0\r\n"));
/* no such key */
shared.pong = createObject(REDIS_STRING,sdsnew("+PONG\r\n"));
shared.wrongtypeerr = createObject(REDIS_STRING,sdsnew(
"-ERR Operation against a key holding the wrong kind of value\r\n"));
shared.nokeyerr = createObject(REDIS_STRING,sdsnew(
"-ERR no such key\r\n"));
shared.syntaxerr = createObject(REDIS_STRING,sdsnew(
"-ERR syntax error\r\n"));
shared.sameobjecterr = createObject(REDIS_STRING,sdsnew(
"-ERR source and destination objects are the same\r\n"));
shared.outofrangeerr = createObject(REDIS_STRING,sdsnew(
"-ERR index out of range\r\n"));
shared.space = createObject(REDIS_STRING,sdsnew(" "));
shared.colon = createObject(REDIS_STRING,sdsnew(":"));
shared.plus = createObject(REDIS_STRING,sdsnew("+"));
shared.select0 = createStringObject("select 0\r\n",10);
shared.select1 = createStringObject("select 1\r\n",10);
shared.select2 = createStringObject("select 2\r\n",10);
shared.select3 = createStringObject("select 3\r\n",10);
shared.select4 = createStringObject("select 4\r\n",10);
shared.select5 = createStringObject("select 5\r\n",10);
shared.select6 = createStringObject("select 6\r\n",10);
shared.select7 = createStringObject("select 7\r\n",10);
shared.select8 = createStringObject("select 8\r\n",10);
shared.select9 = createStringObject("select 9\r\n",10);
}
static void appendServerSaveParams(time_t seconds, int changes) {
server.saveparams = zrealloc(server.saveparams,sizeof(struct saveparam)*(server.saveparamslen+1));
if (server.saveparams == NULL) oom("appendServerSaveParams");
server.saveparams[server.saveparamslen].seconds = seconds;
server.saveparams[server.saveparamslen].changes = changes;
server.saveparamslen++;
}
static void ResetServerSaveParams() {
zfree(server.saveparams);
server.saveparams = NULL;
server.saveparamslen = 0;
}
static void initServerConfig() {
server.dbnum = REDIS_DEFAULT_DBNUM;
server.port = REDIS_SERVERPORT;
server.verbosity = REDIS_DEBUG;
server.maxidletime = REDIS_MAXIDLETIME;
server.saveparams = NULL;
server.logfile = NULL; /* NULL = log on standard output */
server.bindaddr = NULL;
server.glueoutputbuf = 1;
server.daemonize = 0;
server.pidfile = "/var/run/redis.pid";
server.dbfilename = "dump.rdb";
server.requirepass = NULL;
server.shareobjects = 0;
ResetServerSaveParams();
appendServerSaveParams(60*60,1); /* save after 1 hour and 1 change */
appendServerSaveParams(300,100); /* save after 5 minutes and 100 changes */
appendServerSaveParams(60,10000); /* save after 1 minute and 10000 changes */
/* Replication related */
server.isslave = 0;
server.masterhost = NULL;
server.masterport = 6379;
server.master = NULL;
server.replstate = REDIS_REPL_NONE;
}
static void initServer() {
int j;
signal(SIGHUP, SIG_IGN);
signal(SIGPIPE, SIG_IGN);
server.clients = listCreate();
server.slaves = listCreate();
server.monitors = listCreate();
server.objfreelist = listCreate();
createSharedObjects();
server.el = aeCreateEventLoop();
server.dict = zmalloc(sizeof(dict*)*server.dbnum);
server.sharingpool = dictCreate(&setDictType,NULL);
server.sharingpoolsize = 1024;
if (!server.dict || !server.clients || !server.slaves || !server.monitors || !server.el || !server.objfreelist)
oom("server initialization"); /* Fatal OOM */
server.fd = anetTcpServer(server.neterr, server.port, server.bindaddr);
if (server.fd == -1) {
redisLog(REDIS_WARNING, "Opening TCP port: %s", server.neterr);
exit(1);
}
for (j = 0; j < server.dbnum; j++)
server.dict[j] = dictCreate(&hashDictType,NULL);
server.cronloops = 0;
server.bgsaveinprogress = 0;
server.lastsave = time(NULL);
server.dirty = 0;
server.usedmemory = 0;
server.stat_numcommands = 0;
server.stat_numconnections = 0;
server.stat_starttime = time(NULL);
aeCreateTimeEvent(server.el, 1000, serverCron, NULL, NULL);
}
/* Empty the whole database */
static void emptyDb() {
int j;
for (j = 0; j < server.dbnum; j++)
dictEmpty(server.dict[j]);
}
/* I agree, this is a very rudimental way to load a configuration...
will improve later if the config gets more complex */
static void loadServerConfig(char *filename) {
FILE *fp = fopen(filename,"r");
char buf[REDIS_CONFIGLINE_MAX+1], *err = NULL;
int linenum = 0;
sds line = NULL;
if (!fp) {
redisLog(REDIS_WARNING,"Fatal error, can't open config file");
exit(1);
}
while(fgets(buf,REDIS_CONFIGLINE_MAX+1,fp) != NULL) {
sds *argv;
int argc, j;
linenum++;
line = sdsnew(buf);
line = sdstrim(line," \t\r\n");
/* Skip comments and blank lines*/
if (line[0] == '#' || line[0] == '\0') {
sdsfree(line);
continue;
}
/* Split into arguments */
argv = sdssplitlen(line,sdslen(line)," ",1,&argc);
sdstolower(argv[0]);
/* Execute config directives */
if (!strcmp(argv[0],"timeout") && argc == 2) {
server.maxidletime = atoi(argv[1]);
if (server.maxidletime < 1) {
err = "Invalid timeout value"; goto loaderr;
}
} else if (!strcmp(argv[0],"port") && argc == 2) {
server.port = atoi(argv[1]);
if (server.port < 1 || server.port > 65535) {
err = "Invalid port"; goto loaderr;
}
} else if (!strcmp(argv[0],"bind") && argc == 2) {
server.bindaddr = zstrdup(argv[1]);
} else if (!strcmp(argv[0],"save") && argc == 3) {
int seconds = atoi(argv[1]);
int changes = atoi(argv[2]);
if (seconds < 1 || changes < 0) {
err = "Invalid save parameters"; goto loaderr;
}
appendServerSaveParams(seconds,changes);
} else if (!strcmp(argv[0],"dir") && argc == 2) {
if (chdir(argv[1]) == -1) {
redisLog(REDIS_WARNING,"Can't chdir to '%s': %s",
argv[1], strerror(errno));
exit(1);
}
} else if (!strcmp(argv[0],"loglevel") && argc == 2) {
if (!strcmp(argv[1],"debug")) server.verbosity = REDIS_DEBUG;
else if (!strcmp(argv[1],"notice")) server.verbosity = REDIS_NOTICE;
else if (!strcmp(argv[1],"warning")) server.verbosity = REDIS_WARNING;
else {
err = "Invalid log level. Must be one of debug, notice, warning";
goto loaderr;
}
} else if (!strcmp(argv[0],"logfile") && argc == 2) {
FILE *fp;
server.logfile = zstrdup(argv[1]);
if (!strcmp(server.logfile,"stdout")) {
zfree(server.logfile);
server.logfile = NULL;
}
if (server.logfile) {
/* Test if we are able to open the file. The server will not
* be able to abort just for this problem later... */
fp = fopen(server.logfile,"a");
if (fp == NULL) {
err = sdscatprintf(sdsempty(),
"Can't open the log file: %s", strerror(errno));
goto loaderr;
}
fclose(fp);
}
} else if (!strcmp(argv[0],"databases") && argc == 2) {
server.dbnum = atoi(argv[1]);
if (server.dbnum < 1) {
err = "Invalid number of databases"; goto loaderr;
}
} else if (!strcmp(argv[0],"slaveof") && argc == 3) {
server.masterhost = sdsnew(argv[1]);
server.masterport = atoi(argv[2]);
server.replstate = REDIS_REPL_CONNECT;
} else if (!strcmp(argv[0],"glueoutputbuf") && argc == 2) {
sdstolower(argv[1]);
if (!strcmp(argv[1],"yes")) server.glueoutputbuf = 1;
else if (!strcmp(argv[1],"no")) server.glueoutputbuf = 0;
else {
err = "argument must be 'yes' or 'no'"; goto loaderr;
}
} else if (!strcmp(argv[0],"shareobjects") && argc == 2) {
sdstolower(argv[1]);
if (!strcmp(argv[1],"yes")) server.shareobjects = 1;
else if (!strcmp(argv[1],"no")) server.shareobjects = 0;
else {
err = "argument must be 'yes' or 'no'"; goto loaderr;
}
} else if (!strcmp(argv[0],"daemonize") && argc == 2) {
sdstolower(argv[1]);
if (!strcmp(argv[1],"yes")) server.daemonize = 1;
else if (!strcmp(argv[1],"no")) server.daemonize = 0;
else {
err = "argument must be 'yes' or 'no'"; goto loaderr;
}
} else if (!strcmp(argv[0],"requirepass") && argc == 2) {
server.requirepass = zstrdup(argv[1]);
} else if (!strcmp(argv[0],"pidfile") && argc == 2) {
server.pidfile = zstrdup(argv[1]);
} else {
err = "Bad directive or wrong number of arguments"; goto loaderr;
}
for (j = 0; j < argc; j++)
sdsfree(argv[j]);
zfree(argv);
sdsfree(line);
}
fclose(fp);
return;
loaderr:
fprintf(stderr, "\n*** FATAL CONFIG FILE ERROR ***\n");
fprintf(stderr, "Reading the configuration file, at line %d\n", linenum);
fprintf(stderr, ">>> '%s'\n", line);
fprintf(stderr, "%s\n", err);
exit(1);
}
static void freeClientArgv(redisClient *c) {
int j;
for (j = 0; j < c->argc; j++)
decrRefCount(c->argv[j]);
c->argc = 0;
}
static void freeClient(redisClient *c) {
listNode *ln;
aeDeleteFileEvent(server.el,c->fd,AE_READABLE);
aeDeleteFileEvent(server.el,c->fd,AE_WRITABLE);
sdsfree(c->querybuf);
listRelease(c->reply);
freeClientArgv(c);
close(c->fd);
ln = listSearchKey(server.clients,c);
assert(ln != NULL);
listDelNode(server.clients,ln);
if (c->flags & REDIS_SLAVE) {
list *l = (c->flags & REDIS_MONITOR) ? server.monitors : server.slaves;
ln = listSearchKey(l,c);
assert(ln != NULL);
listDelNode(l,ln);
}
if (c->flags & REDIS_MASTER) {
server.master = NULL;
server.replstate = REDIS_REPL_CONNECT;
}
zfree(c);
}
static void glueReplyBuffersIfNeeded(redisClient *c) {
int totlen = 0;
listNode *ln = c->reply->head, *next;
robj *o;
while(ln) {
o = ln->value;
totlen += sdslen(o->ptr);
ln = ln->next;
/* This optimization makes more sense if we don't have to copy
* too much data */
if (totlen > 1024) return;
}
if (totlen > 0) {
char buf[1024];
int copylen = 0;
ln = c->reply->head;
while(ln) {
next = ln->next;
o = ln->value;
memcpy(buf+copylen,o->ptr,sdslen(o->ptr));
copylen += sdslen(o->ptr);
listDelNode(c->reply,ln);
ln = next;
}
/* Now the output buffer is empty, add the new single element */
addReplySds(c,sdsnewlen(buf,totlen));
}
}
static void sendReplyToClient(aeEventLoop *el, int fd, void *privdata, int mask) {
redisClient *c = privdata;
int nwritten = 0, totwritten = 0, objlen;
robj *o;
REDIS_NOTUSED(el);
REDIS_NOTUSED(mask);
if (server.glueoutputbuf && listLength(c->reply) > 1)
glueReplyBuffersIfNeeded(c);
while(listLength(c->reply)) {
o = listNodeValue(listFirst(c->reply));
objlen = sdslen(o->ptr);
if (objlen == 0) {
listDelNode(c->reply,listFirst(c->reply));
continue;
}
if (c->flags & REDIS_MASTER) {
nwritten = objlen - c->sentlen;
} else {
nwritten = write(fd, ((char*)o->ptr)+c->sentlen, objlen - c->sentlen);
if (nwritten <= 0) break;
}
c->sentlen += nwritten;
totwritten += nwritten;
/* If we fully sent the object on head go to the next one */
if (c->sentlen == objlen) {
listDelNode(c->reply,listFirst(c->reply));
c->sentlen = 0;
}
}
if (nwritten == -1) {
if (errno == EAGAIN) {
nwritten = 0;
} else {
redisLog(REDIS_DEBUG,
"Error writing to client: %s", strerror(errno));
freeClient(c);
return;
}
}
if (totwritten > 0) c->lastinteraction = time(NULL);
if (listLength(c->reply) == 0) {
c->sentlen = 0;
aeDeleteFileEvent(server.el,c->fd,AE_WRITABLE);
}
}
static struct redisCommand *lookupCommand(char *name) {
int j = 0;
while(cmdTable[j].name != NULL) {
if (!strcmp(name,cmdTable[j].name)) return &cmdTable[j];
j++;
}
return NULL;
}
/* resetClient prepare the client to process the next command */
static void resetClient(redisClient *c) {
freeClientArgv(c);
c->bulklen = -1;
}
/* If this function gets called we already read a whole
* command, argments are in the client argv/argc fields.
* processCommand() execute the command or prepare the
* server for a bulk read from the client.
*
* If 1 is returned the client is still alive and valid and
* and other operations can be performed by the caller. Otherwise
* if 0 is returned the client was destroied (i.e. after QUIT). */
static int processCommand(redisClient *c) {
struct redisCommand *cmd;
long long dirty;
sdstolower(c->argv[0]->ptr);
/* The QUIT command is handled as a special case. Normal command
* procs are unable to close the client connection safely */
if (!strcmp(c->argv[0]->ptr,"quit")) {
freeClient(c);
return 0;
}
cmd = lookupCommand(c->argv[0]->ptr);
if (!cmd) {
addReplySds(c,sdsnew("-ERR unknown command\r\n"));
resetClient(c);
return 1;
} else if ((cmd->arity > 0 && cmd->arity != c->argc) ||
(c->argc < -cmd->arity)) {
addReplySds(c,sdsnew("-ERR wrong number of arguments\r\n"));
resetClient(c);
return 1;
} else if (cmd->flags & REDIS_CMD_BULK && c->bulklen == -1) {
int bulklen = atoi(c->argv[c->argc-1]->ptr);
decrRefCount(c->argv[c->argc-1]);
if (bulklen < 0 || bulklen > 1024*1024*1024) {
c->argc--;
addReplySds(c,sdsnew("-ERR invalid bulk write count\r\n"));
resetClient(c);
return 1;
}
c->argc--;
c->bulklen = bulklen+2; /* add two bytes for CR+LF */
/* It is possible that the bulk read is already in the
* buffer. Check this condition and handle it accordingly */
if ((signed)sdslen(c->querybuf) >= c->bulklen) {
c->argv[c->argc] = createStringObject(c->querybuf,c->bulklen-2);
c->argc++;
c->querybuf = sdsrange(c->querybuf,c->bulklen,-1);
} else {
return 1;
}
}
/* Let's try to share objects on the command arguments vector */
if (server.shareobjects) {
int j;
for(j = 1; j < c->argc; j++)
c->argv[j] = tryObjectSharing(c->argv[j]);
}
/* Check if the user is authenticated */
if (server.requirepass && !c->authenticated && cmd->proc != authCommand) {
addReplySds(c,sdsnew("-ERR operation not permitted\r\n"));
resetClient(c);
return 1;
}
/* Exec the command */
dirty = server.dirty;
cmd->proc(c);
if (server.dirty-dirty != 0 && listLength(server.slaves))
replicationFeedSlaves(server.slaves,cmd,c->dictid,c->argv,c->argc);
if (listLength(server.monitors))
replicationFeedSlaves(server.monitors,cmd,c->dictid,c->argv,c->argc);
server.stat_numcommands++;
/* Prepare the client for the next command */
if (c->flags & REDIS_CLOSE) {
freeClient(c);
return 0;
}
resetClient(c);
return 1;
}
static void replicationFeedSlaves(list *slaves, struct redisCommand *cmd, int dictid, robj **argv, int argc) {
listNode *ln = slaves->head;
robj *outv[REDIS_MAX_ARGS*4]; /* enough room for args, spaces, newlines */
int outc = 0, j;
for (j = 0; j < argc; j++) {
if (j != 0) outv[outc++] = shared.space;
if ((cmd->flags & REDIS_CMD_BULK) && j == argc-1) {
robj *lenobj;
lenobj = createObject(REDIS_STRING,
sdscatprintf(sdsempty(),"%d\r\n",sdslen(argv[j]->ptr)));
lenobj->refcount = 0;
outv[outc++] = lenobj;
}
outv[outc++] = argv[j];
}
outv[outc++] = shared.crlf;
while(ln) {
redisClient *slave = ln->value;
if (slave->slaveseldb != dictid) {
robj *selectcmd;
switch(dictid) {
case 0: selectcmd = shared.select0; break;
case 1: selectcmd = shared.select1; break;
case 2: selectcmd = shared.select2; break;
case 3: selectcmd = shared.select3; break;
case 4: selectcmd = shared.select4; break;
case 5: selectcmd = shared.select5; break;
case 6: selectcmd = shared.select6; break;
case 7: selectcmd = shared.select7; break;
case 8: selectcmd = shared.select8; break;
case 9: selectcmd = shared.select9; break;
default:
selectcmd = createObject(REDIS_STRING,
sdscatprintf(sdsempty(),"select %d\r\n",dictid));
selectcmd->refcount = 0;
break;
}
addReply(slave,selectcmd);
slave->slaveseldb = dictid;
}
for (j = 0; j < outc; j++) addReply(slave,outv[j]);
ln = ln->next;
}
}
static void readQueryFromClient(aeEventLoop *el, int fd, void *privdata, int mask) {
redisClient *c = (redisClient*) privdata;
char buf[REDIS_QUERYBUF_LEN];
int nread;
REDIS_NOTUSED(el);
REDIS_NOTUSED(mask);
nread = read(fd, buf, REDIS_QUERYBUF_LEN);
if (nread == -1) {
if (errno == EAGAIN) {
nread = 0;
} else {
redisLog(REDIS_DEBUG, "Reading from client: %s",strerror(errno));
freeClient(c);
return;
}
} else if (nread == 0) {
redisLog(REDIS_DEBUG, "Client closed connection");
freeClient(c);
return;
}
if (nread) {
c->querybuf = sdscatlen(c->querybuf, buf, nread);
c->lastinteraction = time(NULL);
} else {
return;
}
again:
if (c->bulklen == -1) {
/* Read the first line of the query */
char *p = strchr(c->querybuf,'\n');
size_t querylen;
if (p) {
sds query, *argv;
int argc, j;
query = c->querybuf;
c->querybuf = sdsempty();
querylen = 1+(p-(query));
if (sdslen(query) > querylen) {
/* leave data after the first line of the query in the buffer */
c->querybuf = sdscatlen(c->querybuf,query+querylen,sdslen(query)-querylen);
}
*p = '\0'; /* remove "\n" */
if (*(p-1) == '\r') *(p-1) = '\0'; /* and "\r" if any */
sdsupdatelen(query);
/* Now we can split the query in arguments */
if (sdslen(query) == 0) {
/* Ignore empty query */
sdsfree(query);
return;
}
argv = sdssplitlen(query,sdslen(query)," ",1,&argc);
sdsfree(query);
if (argv == NULL) oom("sdssplitlen");
for (j = 0; j < argc && j < REDIS_MAX_ARGS; j++) {
if (sdslen(argv[j])) {
c->argv[c->argc] = createObject(REDIS_STRING,argv[j]);
c->argc++;
} else {
sdsfree(argv[j]);
}
}
zfree(argv);
/* Execute the command. If the client is still valid
* after processCommand() return and there is something
* on the query buffer try to process the next command. */
if (processCommand(c) && sdslen(c->querybuf)) goto again;
return;
} else if (sdslen(c->querybuf) >= 1024) {
redisLog(REDIS_DEBUG, "Client protocol error");
freeClient(c);
return;
}
} else {
/* Bulk read handling. Note that if we are at this point
the client already sent a command terminated with a newline,
we are reading the bulk data that is actually the last
argument of the command. */
int qbl = sdslen(c->querybuf);
if (c->bulklen <= qbl) {
/* Copy everything but the final CRLF as final argument */
c->argv[c->argc] = createStringObject(c->querybuf,c->bulklen-2);
c->argc++;
c->querybuf = sdsrange(c->querybuf,c->bulklen,-1);
processCommand(c);
return;
}
}
}
static int selectDb(redisClient *c, int id) {
if (id < 0 || id >= server.dbnum)
return REDIS_ERR;
c->dict = server.dict[id];
c->dictid = id;
return REDIS_OK;
}
static redisClient *createClient(int fd) {
redisClient *c = zmalloc(sizeof(*c));
anetNonBlock(NULL,fd);
anetTcpNoDelay(NULL,fd);
if (!c) return NULL;
selectDb(c,0);
c->fd = fd;
c->querybuf = sdsempty();
c->argc = 0;
c->bulklen = -1;
c->sentlen = 0;
c->flags = 0;
c->lastinteraction = time(NULL);
c->authenticated = 0;
if ((c->reply = listCreate()) == NULL) oom("listCreate");
listSetFreeMethod(c->reply,decrRefCount);
if (aeCreateFileEvent(server.el, c->fd, AE_READABLE,
readQueryFromClient, c, NULL) == AE_ERR) {
freeClient(c);
return NULL;
}
if (!listAddNodeTail(server.clients,c)) oom("listAddNodeTail");
return c;
}
static void addReply(redisClient *c, robj *obj) {
if (listLength(c->reply) == 0 &&
aeCreateFileEvent(server.el, c->fd, AE_WRITABLE,
sendReplyToClient, c, NULL) == AE_ERR) return;
if (!listAddNodeTail(c->reply,obj)) oom("listAddNodeTail");
incrRefCount(obj);
}
static void addReplySds(redisClient *c, sds s) {
robj *o = createObject(REDIS_STRING,s);
addReply(c,o);
decrRefCount(o);
}
static void acceptHandler(aeEventLoop *el, int fd, void *privdata, int mask) {
int cport, cfd;
char cip[128];
REDIS_NOTUSED(el);
REDIS_NOTUSED(mask);
REDIS_NOTUSED(privdata);
cfd = anetAccept(server.neterr, fd, cip, &cport);
if (cfd == AE_ERR) {
redisLog(REDIS_DEBUG,"Accepting client connection: %s", server.neterr);
return;
}
redisLog(REDIS_DEBUG,"Accepted %s:%d", cip, cport);
if (createClient(cfd) == NULL) {
redisLog(REDIS_WARNING,"Error allocating resoures for the client");
close(cfd); /* May be already closed, just ingore errors */
return;
}
server.stat_numconnections++;
}
/* ======================= Redis objects implementation ===================== */
static robj *createObject(int type, void *ptr) {
robj *o;
if (listLength(server.objfreelist)) {
listNode *head = listFirst(server.objfreelist);
o = listNodeValue(head);
listDelNode(server.objfreelist,head);
} else {
o = zmalloc(sizeof(*o));
}
if (!o) oom("createObject");
o->type = type;
o->ptr = ptr;
o->refcount = 1;
return o;
}
static robj *createStringObject(char *ptr, size_t len) {
return createObject(REDIS_STRING,sdsnewlen(ptr,len));
}
static robj *createListObject(void) {
list *l = listCreate();
if (!l) oom("listCreate");
listSetFreeMethod(l,decrRefCount);
return createObject(REDIS_LIST,l);
}
static robj *createSetObject(void) {
dict *d = dictCreate(&setDictType,NULL);
if (!d) oom("dictCreate");
return createObject(REDIS_SET,d);
}
#if 0
static robj *createHashObject(void) {
dict *d = dictCreate(&hashDictType,NULL);
if (!d) oom("dictCreate");
return createObject(REDIS_SET,d);
}
#endif
static void freeStringObject(robj *o) {
sdsfree(o->ptr);
}
static void freeListObject(robj *o) {
listRelease((list*) o->ptr);
}
static void freeSetObject(robj *o) {
dictRelease((dict*) o->ptr);
}
static void freeHashObject(robj *o) {
dictRelease((dict*) o->ptr);
}
static void incrRefCount(robj *o) {
o->refcount++;
}
static void decrRefCount(void *obj) {
robj *o = obj;
if (--(o->refcount) == 0) {
switch(o->type) {
case REDIS_STRING: freeStringObject(o); break;
case REDIS_LIST: freeListObject(o); break;
case REDIS_SET: freeSetObject(o); break;
case REDIS_HASH: freeHashObject(o); break;
default: assert(0 != 0); break;
}
if (listLength(server.objfreelist) > REDIS_OBJFREELIST_MAX ||
!listAddNodeHead(server.objfreelist,o))
zfree(o);
}
}
/* Try to share an object against the shared objects pool */
static robj *tryObjectSharing(robj *o) {
struct dictEntry *de;
unsigned long c;
if (server.shareobjects == 0) return o;
assert(o->type == REDIS_STRING);
de = dictFind(server.sharingpool,o);
if (de) {
robj *shared = dictGetEntryKey(de);
c = ((unsigned long) dictGetEntryVal(de))+1;
dictGetEntryVal(de) = (void*) c;
incrRefCount(shared);
decrRefCount(o);
return shared;
} else {
/* Here we are using a stream algorihtm: Every time an object is
* shared we increment its count, everytime there is a miss we
* recrement the counter of a random object. If this object reaches
* zero we remove the object and put the current object instead. */
if (dictGetHashTableUsed(server.sharingpool) >=
server.sharingpoolsize) {
de = dictGetRandomKey(server.sharingpool);
assert(de != NULL);
c = ((unsigned long) dictGetEntryVal(de))-1;
dictGetEntryVal(de) = (void*) c;
if (c == 0) {
dictDelete(server.sharingpool,de->key);
}
} else {
c = 0; /* If the pool is empty we want to add this object */
}
if (c == 0) {
int retval;
retval = dictAdd(server.sharingpool,o,(void*)1);
assert(retval == DICT_OK);
incrRefCount(o);
}
return o;
}
}
/*============================ DB saving/loading ============================ */
static int rdbSaveType(FILE *fp, unsigned char type) {
if (fwrite(&type,1,1,fp) == 0) return -1;
return 0;
}
static int rdbSaveLen(FILE *fp, uint32_t len) {
unsigned char buf[2];
if (len < (1<<6)) {
/* Save a 6 bit len */
buf[0] = (len&0xFF)|(REDIS_RDB_6BITLEN<<6);
if (fwrite(buf,1,1,fp) == 0) return -1;
} else if (len < (1<<14)) {
/* Save a 14 bit len */
buf[0] = ((len>>8)&0xFF)|(REDIS_RDB_14BITLEN<<6);
buf[1] = len&0xFF;
if (fwrite(buf,2,1,fp) == 0) return -1;
} else {
/* Save a 32 bit len */
buf[0] = (REDIS_RDB_32BITLEN<<6);
if (fwrite(buf,1,1,fp) == 0) return -1;
len = htonl(len);
if (fwrite(&len,4,1,fp) == 0) return -1;
}
return 0;
}
static int rdbSaveStringObject(FILE *fp, robj *obj) {
size_t len = sdslen(obj->ptr);
if (rdbSaveLen(fp,len) == -1) return -1;
if (len && fwrite(obj->ptr,len,1,fp) == 0) return -1;
return 0;
}
/* Save the DB on disk. Return REDIS_ERR on error, REDIS_OK on success */
static int rdbSave(char *filename) {
dictIterator *di = NULL;
dictEntry *de;
FILE *fp;
char tmpfile[256];
int j;
snprintf(tmpfile,256,"temp-%d.%ld.rdb",(int)time(NULL),(long int)random());
fp = fopen(tmpfile,"w");
if (!fp) {
redisLog(REDIS_WARNING, "Failed saving the DB: %s", strerror(errno));
return REDIS_ERR;
}
if (fwrite("REDIS0001",9,1,fp) == 0) goto werr;
for (j = 0; j < server.dbnum; j++) {
dict *d = server.dict[j];
if (dictGetHashTableUsed(d) == 0) continue;
di = dictGetIterator(d);
if (!di) {
fclose(fp);
return REDIS_ERR;
}
/* Write the SELECT DB opcode */
if (rdbSaveType(fp,REDIS_SELECTDB) == -1) goto werr;
if (rdbSaveLen(fp,j) == -1) goto werr;
/* Iterate this DB writing every entry */
while((de = dictNext(di)) != NULL) {
robj *key = dictGetEntryKey(de);
robj *o = dictGetEntryVal(de);
if (rdbSaveType(fp,o->type) == -1) goto werr;
if (rdbSaveStringObject(fp,key) == -1) goto werr;
if (o->type == REDIS_STRING) {
/* Save a string value */
if (rdbSaveStringObject(fp,o) == -1) goto werr;
} else if (o->type == REDIS_LIST) {
/* Save a list value */
list *list = o->ptr;
listNode *ln = list->head;
if (rdbSaveLen(fp,listLength(list)) == -1) goto werr;
while(ln) {
robj *eleobj = listNodeValue(ln);
if (rdbSaveStringObject(fp,eleobj) == -1) goto werr;
ln = ln->next;
}
} else if (o->type == REDIS_SET) {
/* Save a set value */
dict *set = o->ptr;
dictIterator *di = dictGetIterator(set);
dictEntry *de;
if (!set) oom("dictGetIteraotr");
if (rdbSaveLen(fp,dictGetHashTableUsed(set)) == -1) goto werr;
while((de = dictNext(di)) != NULL) {
robj *eleobj = dictGetEntryKey(de);
if (rdbSaveStringObject(fp,eleobj) == -1) goto werr;
}
dictReleaseIterator(di);
} else {
assert(0 != 0);
}
}
dictReleaseIterator(di);
}
/* EOF opcode */
if (rdbSaveType(fp,REDIS_EOF) == -1) goto werr;
/* Make sure data will not remain on the OS's output buffers */
fflush(fp);
fsync(fileno(fp));
fclose(fp);
/* Use RENAME to make sure the DB file is changed atomically only
* if the generate DB file is ok. */
if (rename(tmpfile,filename) == -1) {
redisLog(REDIS_WARNING,"Error moving temp DB file on the final destionation: %s", strerror(errno));
unlink(tmpfile);
return REDIS_ERR;
}
redisLog(REDIS_NOTICE,"DB saved on disk");
server.dirty = 0;
server.lastsave = time(NULL);
return REDIS_OK;
werr:
fclose(fp);
unlink(tmpfile);
redisLog(REDIS_WARNING,"Write error saving DB on disk: %s", strerror(errno));
if (di) dictReleaseIterator(di);
return REDIS_ERR;
}
static int rdbSaveBackground(char *filename) {
pid_t childpid;
if (server.bgsaveinprogress) return REDIS_ERR;
if ((childpid = fork()) == 0) {
/* Child */
close(server.fd);
if (rdbSave(filename) == REDIS_OK) {
exit(0);
} else {
exit(1);
}
} else {
/* Parent */
redisLog(REDIS_NOTICE,"Background saving started by pid %d",childpid);
server.bgsaveinprogress = 1;
return REDIS_OK;
}
return REDIS_OK; /* unreached */
}
static int rdbLoadType(FILE *fp) {
unsigned char type;
if (fread(&type,1,1,fp) == 0) return -1;
return type;
}
static uint32_t rdbLoadLen(FILE *fp, int rdbver) {
unsigned char buf[2];
uint32_t len;
if (rdbver == 0) {
if (fread(&len,4,1,fp) == 0) return REDIS_RDB_LENERR;
return ntohl(len);
} else {
int type;
if (fread(buf,1,1,fp) == 0) return REDIS_RDB_LENERR;
type = (buf[0]&0xC0)>>6;
if (type == REDIS_RDB_6BITLEN) {
/* Read a 6 bit len */
return buf[0];
} else if (type == REDIS_RDB_14BITLEN) {
/* Read a 14 bit len */
if (fread(buf+1,1,1,fp) == 0) return REDIS_RDB_LENERR;
return ((buf[0]&0x3F)<<8)|buf[1];
} else {
/* Read a 32 bit len */
if (fread(&len,4,1,fp) == 0) return REDIS_RDB_LENERR;
return ntohl(len);
}
}
}
static robj *rdbLoadStringObject(FILE*fp,int rdbver) {
uint32_t len = rdbLoadLen(fp,rdbver);
sds val;
if (len == REDIS_RDB_LENERR) return NULL;
val = sdsnewlen(NULL,len);
if (len && fread(val,len,1,fp) == 0) {
sdsfree(val);
return NULL;
}
return tryObjectSharing(createObject(REDIS_STRING,val));
}
static int rdbLoad(char *filename) {
FILE *fp;
robj *keyobj = NULL;
uint32_t dbid;
int type;
int retval;
dict *d = server.dict[0];
char buf[1024];
int rdbver;
fp = fopen(filename,"r");
if (!fp) return REDIS_ERR;
if (fread(buf,9,1,fp) == 0) goto eoferr;
buf[9] = '\0';
if (memcmp(buf,"REDIS",5) != 0) {
fclose(fp);
redisLog(REDIS_WARNING,"Wrong signature trying to load DB from file");
return REDIS_ERR;
}
rdbver = atoi(buf+5);
if (rdbver > 1) {
fclose(fp);
redisLog(REDIS_WARNING,"Can't handle RDB format version %d",rdbver);
return REDIS_ERR;
}
while(1) {
robj *o;
/* Read type. */
if ((type = rdbLoadType(fp)) == -1) goto eoferr;
if (type == REDIS_EOF) break;
/* Handle SELECT DB opcode as a special case */
if (type == REDIS_SELECTDB) {
if ((dbid = rdbLoadLen(fp,rdbver)) == REDIS_RDB_LENERR) goto eoferr;
if (dbid >= (unsigned)server.dbnum) {
redisLog(REDIS_WARNING,"FATAL: Data file was created with a Redis server configured to handle more than %d databases. Exiting\n", server.dbnum);
exit(1);
}
d = server.dict[dbid];
continue;
}
/* Read key */
if ((keyobj = rdbLoadStringObject(fp,rdbver)) == NULL) goto eoferr;
if (type == REDIS_STRING) {
/* Read string value */
if ((o = rdbLoadStringObject(fp,rdbver)) == NULL) goto eoferr;
} else if (type == REDIS_LIST || type == REDIS_SET) {
/* Read list/set value */
uint32_t listlen;
if ((listlen = rdbLoadLen(fp,rdbver)) == REDIS_RDB_LENERR)
goto eoferr;
o = (type == REDIS_LIST) ? createListObject() : createSetObject();
/* Load every single element of the list/set */
while(listlen--) {
robj *ele;
if ((ele = rdbLoadStringObject(fp,rdbver)) == NULL) goto eoferr;
if (type == REDIS_LIST) {
if (!listAddNodeTail((list*)o->ptr,ele))
oom("listAddNodeTail");
} else {
if (dictAdd((dict*)o->ptr,ele,NULL) == DICT_ERR)
oom("dictAdd");
}
}
} else {
assert(0 != 0);
}
/* Add the new object in the hash table */
retval = dictAdd(d,keyobj,o);
if (retval == DICT_ERR) {
redisLog(REDIS_WARNING,"Loading DB, duplicated key (%s) found! Unrecoverable error, exiting now.", keyobj->ptr);
exit(1);
}
keyobj = o = NULL;
}
fclose(fp);
return REDIS_OK;
eoferr: /* unexpected end of file is handled here with a fatal exit */
decrRefCount(keyobj);
redisLog(REDIS_WARNING,"Short read loading DB. Unrecoverable error, exiting now.");
exit(1);
return REDIS_ERR; /* Just to avoid warning */
}
/*================================== Commands =============================== */
static void authCommand(redisClient *c) {
if (!strcmp(c->argv[1]->ptr, server.requirepass)) {
c->authenticated = 1;
addReply(c,shared.ok);
} else {
c->authenticated = 0;
addReply(c,shared.err);
}
}
static void pingCommand(redisClient *c) {
addReply(c,shared.pong);
}
static void echoCommand(redisClient *c) {
addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n",
(int)sdslen(c->argv[1]->ptr)));
addReply(c,c->argv[1]);
addReply(c,shared.crlf);
}
/*=================================== Strings =============================== */
static void setGenericCommand(redisClient *c, int nx) {
int retval;
retval = dictAdd(c->dict,c->argv[1],c->argv[2]);
if (retval == DICT_ERR) {
if (!nx) {
dictReplace(c->dict,c->argv[1],c->argv[2]);
incrRefCount(c->argv[2]);
} else {
addReply(c,shared.czero);
return;
}
} else {
incrRefCount(c->argv[1]);
incrRefCount(c->argv[2]);
}
server.dirty++;
addReply(c, nx ? shared.cone : shared.ok);
}
static void setCommand(redisClient *c) {
setGenericCommand(c,0);
}
static void setnxCommand(redisClient *c) {
setGenericCommand(c,1);
}
static void getCommand(redisClient *c) {
dictEntry *de;
de = dictFind(c->dict,c->argv[1]);
if (de == NULL) {
addReply(c,shared.nullbulk);
} else {
robj *o = dictGetEntryVal(de);
if (o->type != REDIS_STRING) {
addReply(c,shared.wrongtypeerr);
} else {
addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n",(int)sdslen(o->ptr)));
addReply(c,o);
addReply(c,shared.crlf);
}
}
}
static void mgetCommand(redisClient *c) {
dictEntry *de;
int j;
addReplySds(c,sdscatprintf(sdsempty(),"*%d\r\n",c->argc-1));
for (j = 1; j < c->argc; j++) {
de = dictFind(c->dict,c->argv[j]);
if (de == NULL) {
addReply(c,shared.nullbulk);
} else {
robj *o = dictGetEntryVal(de);
if (o->type != REDIS_STRING) {
addReply(c,shared.nullbulk);
} else {
addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n",(int)sdslen(o->ptr)));
addReply(c,o);
addReply(c,shared.crlf);
}
}
}
}
static void incrDecrCommand(redisClient *c, int incr) {
dictEntry *de;
long long value;
int retval;
robj *o;
de = dictFind(c->dict,c->argv[1]);
if (de == NULL) {
value = 0;
} else {
robj *o = dictGetEntryVal(de);
if (o->type != REDIS_STRING) {
value = 0;
} else {
char *eptr;
value = strtoll(o->ptr, &eptr, 10);
}
}
value += incr;
o = createObject(REDIS_STRING,sdscatprintf(sdsempty(),"%lld",value));
retval = dictAdd(c->dict,c->argv[1],o);
if (retval == DICT_ERR) {
dictReplace(c->dict,c->argv[1],o);
} else {
incrRefCount(c->argv[1]);
}
server.dirty++;
addReply(c,shared.colon);
addReply(c,o);
addReply(c,shared.crlf);
}
static void incrCommand(redisClient *c) {
incrDecrCommand(c,1);
}
static void decrCommand(redisClient *c) {
incrDecrCommand(c,-1);
}
static void incrbyCommand(redisClient *c) {
int incr = atoi(c->argv[2]->ptr);
incrDecrCommand(c,incr);
}
static void decrbyCommand(redisClient *c) {
int incr = atoi(c->argv[2]->ptr);
incrDecrCommand(c,-incr);
}
/* ========================= Type agnostic commands ========================= */
static void delCommand(redisClient *c) {
if (dictDelete(c->dict,c->argv[1]) == DICT_OK) {
server.dirty++;
addReply(c,shared.cone);
} else {
addReply(c,shared.czero);
}
}
static void existsCommand(redisClient *c) {
dictEntry *de;
de = dictFind(c->dict,c->argv[1]);
if (de == NULL)
addReply(c,shared.czero);
else
addReply(c,shared.cone);
}
static void selectCommand(redisClient *c) {
int id = atoi(c->argv[1]->ptr);
if (selectDb(c,id) == REDIS_ERR) {
addReplySds(c,"-ERR invalid DB index\r\n");
} else {
addReply(c,shared.ok);
}
}
static void randomkeyCommand(redisClient *c) {
dictEntry *de;
de = dictGetRandomKey(c->dict);
if (de == NULL) {
addReply(c,shared.crlf);
} else {
addReply(c,shared.plus);
addReply(c,dictGetEntryKey(de));
addReply(c,shared.crlf);
}
}
static void keysCommand(redisClient *c) {
dictIterator *di;
dictEntry *de;
sds pattern = c->argv[1]->ptr;
int plen = sdslen(pattern);
int numkeys = 0, keyslen = 0;
robj *lenobj = createObject(REDIS_STRING,NULL);
di = dictGetIterator(c->dict);
if (!di) oom("dictGetIterator");
addReply(c,lenobj);
decrRefCount(lenobj);
while((de = dictNext(di)) != NULL) {
robj *keyobj = dictGetEntryKey(de);
sds key = keyobj->ptr;
if ((pattern[0] == '*' && pattern[1] == '\0') ||
stringmatchlen(pattern,plen,key,sdslen(key),0)) {
if (numkeys != 0)
addReply(c,shared.space);
addReply(c,keyobj);
numkeys++;
keyslen += sdslen(key);
}
}
dictReleaseIterator(di);
lenobj->ptr = sdscatprintf(sdsempty(),"$%lu\r\n",keyslen+(numkeys ? (numkeys-1) : 0));
addReply(c,shared.crlf);
}
static void dbsizeCommand(redisClient *c) {
addReplySds(c,
sdscatprintf(sdsempty(),":%lu\r\n",dictGetHashTableUsed(c->dict)));
}
static void lastsaveCommand(redisClient *c) {
addReplySds(c,
sdscatprintf(sdsempty(),":%lu\r\n",server.lastsave));
}
static void typeCommand(redisClient *c) {
dictEntry *de;
char *type;
de = dictFind(c->dict,c->argv[1]);
if (de == NULL) {
type = "+none";
} else {
robj *o = dictGetEntryVal(de);
switch(o->type) {
case REDIS_STRING: type = "+string"; break;
case REDIS_LIST: type = "+list"; break;
case REDIS_SET: type = "+set"; break;
default: type = "unknown"; break;
}
}
addReplySds(c,sdsnew(type));
addReply(c,shared.crlf);
}
static void saveCommand(redisClient *c) {
if (rdbSave(server.dbfilename) == REDIS_OK) {
addReply(c,shared.ok);
} else {
addReply(c,shared.err);
}
}
static void bgsaveCommand(redisClient *c) {
if (server.bgsaveinprogress) {
addReplySds(c,sdsnew("-ERR background save already in progress\r\n"));
return;
}
if (rdbSaveBackground(server.dbfilename) == REDIS_OK) {
addReply(c,shared.ok);
} else {
addReply(c,shared.err);
}
}
static void shutdownCommand(redisClient *c) {
redisLog(REDIS_WARNING,"User requested shutdown, saving DB...");
if (rdbSave(server.dbfilename) == REDIS_OK) {
if (server.daemonize) {
unlink(server.pidfile);
}
redisLog(REDIS_WARNING,"Server exit now, bye bye...");
exit(1);
} else {
redisLog(REDIS_WARNING,"Error trying to save the DB, can't exit");
addReplySds(c,sdsnew("-ERR can't quit, problems saving the DB\r\n"));
}
}
static void renameGenericCommand(redisClient *c, int nx) {
dictEntry *de;
robj *o;
/* To use the same key as src and dst is probably an error */
if (sdscmp(c->argv[1]->ptr,c->argv[2]->ptr) == 0) {
addReply(c,shared.sameobjecterr);
return;
}
de = dictFind(c->dict,c->argv[1]);
if (de == NULL) {
addReply(c,shared.nokeyerr);
return;
}
o = dictGetEntryVal(de);
incrRefCount(o);
if (dictAdd(c->dict,c->argv[2],o) == DICT_ERR) {
if (nx) {
decrRefCount(o);
addReply(c,shared.czero);
return;
}
dictReplace(c->dict,c->argv[2],o);
} else {
incrRefCount(c->argv[2]);
}
dictDelete(c->dict,c->argv[1]);
server.dirty++;
addReply(c,nx ? shared.cone : shared.ok);
}
static void renameCommand(redisClient *c) {
renameGenericCommand(c,0);
}
static void renamenxCommand(redisClient *c) {
renameGenericCommand(c,1);
}
static void moveCommand(redisClient *c) {
dictEntry *de;
robj *o, *key;
dict *src, *dst;
int srcid;
/* Obtain source and target DB pointers */
src = c->dict;
srcid = c->dictid;
if (selectDb(c,atoi(c->argv[2]->ptr)) == REDIS_ERR) {
addReply(c,shared.outofrangeerr);
return;
}
dst = c->dict;
c->dict = src;
c->dictid = srcid;
/* If the user is moving using as target the same
* DB as the source DB it is probably an error. */
if (src == dst) {
addReply(c,shared.sameobjecterr);
return;
}
/* Check if the element exists and get a reference */
de = dictFind(c->dict,c->argv[1]);
if (!de) {
addReply(c,shared.czero);
return;
}
/* Try to add the element to the target DB */
key = dictGetEntryKey(de);
o = dictGetEntryVal(de);
if (dictAdd(dst,key,o) == DICT_ERR) {
addReply(c,shared.czero);
return;
}
incrRefCount(key);
incrRefCount(o);
/* OK! key moved, free the entry in the source DB */
dictDelete(src,c->argv[1]);
server.dirty++;
addReply(c,shared.cone);
}
/* =================================== Lists ================================ */
static void pushGenericCommand(redisClient *c, int where) {
robj *lobj;
dictEntry *de;
list *list;
de = dictFind(c->dict,c->argv[1]);
if (de == NULL) {
lobj = createListObject();
list = lobj->ptr;
if (where == REDIS_HEAD) {
if (!listAddNodeHead(list,c->argv[2])) oom("listAddNodeHead");
} else {
if (!listAddNodeTail(list,c->argv[2])) oom("listAddNodeTail");
}
dictAdd(c->dict,c->argv[1],lobj);
incrRefCount(c->argv[1]);
incrRefCount(c->argv[2]);
} else {
lobj = dictGetEntryVal(de);
if (lobj->type != REDIS_LIST) {
addReply(c,shared.wrongtypeerr);
return;
}
list = lobj->ptr;
if (where == REDIS_HEAD) {
if (!listAddNodeHead(list,c->argv[2])) oom("listAddNodeHead");
} else {
if (!listAddNodeTail(list,c->argv[2])) oom("listAddNodeTail");
}
incrRefCount(c->argv[2]);
}
server.dirty++;
addReply(c,shared.ok);
}
static void lpushCommand(redisClient *c) {
pushGenericCommand(c,REDIS_HEAD);
}
static void rpushCommand(redisClient *c) {
pushGenericCommand(c,REDIS_TAIL);
}
static void llenCommand(redisClient *c) {
dictEntry *de;
list *l;
de = dictFind(c->dict,c->argv[1]);
if (de == NULL) {
addReply(c,shared.czero);
return;
} else {
robj *o = dictGetEntryVal(de);
if (o->type != REDIS_LIST) {
addReply(c,shared.wrongtypeerr);
} else {
l = o->ptr;
addReplySds(c,sdscatprintf(sdsempty(),":%d\r\n",listLength(l)));
}
}
}
static void lindexCommand(redisClient *c) {
dictEntry *de;
int index = atoi(c->argv[2]->ptr);
de = dictFind(c->dict,c->argv[1]);
if (de == NULL) {
addReply(c,shared.nullbulk);
} else {
robj *o = dictGetEntryVal(de);
if (o->type != REDIS_LIST) {
addReply(c,shared.wrongtypeerr);
} else {
list *list = o->ptr;
listNode *ln;
ln = listIndex(list, index);
if (ln == NULL) {
addReply(c,shared.nullbulk);
} else {
robj *ele = listNodeValue(ln);
addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n",(int)sdslen(ele->ptr)));
addReply(c,ele);
addReply(c,shared.crlf);
}
}
}
}
static void lsetCommand(redisClient *c) {
dictEntry *de;
int index = atoi(c->argv[2]->ptr);
de = dictFind(c->dict,c->argv[1]);
if (de == NULL) {
addReply(c,shared.nokeyerr);
} else {
robj *o = dictGetEntryVal(de);
if (o->type != REDIS_LIST) {
addReply(c,shared.wrongtypeerr);
} else {
list *list = o->ptr;
listNode *ln;
ln = listIndex(list, index);
if (ln == NULL) {
addReply(c,shared.outofrangeerr);
} else {
robj *ele = listNodeValue(ln);
decrRefCount(ele);
listNodeValue(ln) = c->argv[3];
incrRefCount(c->argv[3]);
addReply(c,shared.ok);
server.dirty++;
}
}
}
}
static void popGenericCommand(redisClient *c, int where) {
dictEntry *de;
de = dictFind(c->dict,c->argv[1]);
if (de == NULL) {
addReply(c,shared.nullbulk);
} else {
robj *o = dictGetEntryVal(de);
if (o->type != REDIS_LIST) {
addReply(c,shared.wrongtypeerr);
} else {
list *list = o->ptr;
listNode *ln;
if (where == REDIS_HEAD)
ln = listFirst(list);
else
ln = listLast(list);
if (ln == NULL) {
addReply(c,shared.nullbulk);
} else {
robj *ele = listNodeValue(ln);
addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n",(int)sdslen(ele->ptr)));
addReply(c,ele);
addReply(c,shared.crlf);
listDelNode(list,ln);
server.dirty++;
}
}
}
}
static void lpopCommand(redisClient *c) {
popGenericCommand(c,REDIS_HEAD);
}
static void rpopCommand(redisClient *c) {
popGenericCommand(c,REDIS_TAIL);
}
static void lrangeCommand(redisClient *c) {
dictEntry *de;
int start = atoi(c->argv[2]->ptr);
int end = atoi(c->argv[3]->ptr);
de = dictFind(c->dict,c->argv[1]);
if (de == NULL) {
addReply(c,shared.nullmultibulk);
} else {
robj *o = dictGetEntryVal(de);
if (o->type != REDIS_LIST) {
addReply(c,shared.wrongtypeerr);
} else {
list *list = o->ptr;
listNode *ln;
int llen = listLength(list);
int rangelen, j;
robj *ele;
/* convert negative indexes */
if (start < 0) start = llen+start;
if (end < 0) end = llen+end;
if (start < 0) start = 0;
if (end < 0) end = 0;
/* indexes sanity checks */
if (start > end || start >= llen) {
/* Out of range start or start > end result in empty list */
addReply(c,shared.emptymultibulk);
return;
}
if (end >= llen) end = llen-1;
rangelen = (end-start)+1;
/* Return the result in form of a multi-bulk reply */
ln = listIndex(list, start);
addReplySds(c,sdscatprintf(sdsempty(),"*%d\r\n",rangelen));
for (j = 0; j < rangelen; j++) {
ele = listNodeValue(ln);
addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n",(int)sdslen(ele->ptr)));
addReply(c,ele);
addReply(c,shared.crlf);
ln = ln->next;
}
}
}
}
static void ltrimCommand(redisClient *c) {
dictEntry *de;
int start = atoi(c->argv[2]->ptr);
int end = atoi(c->argv[3]->ptr);
de = dictFind(c->dict,c->argv[1]);
if (de == NULL) {
addReply(c,shared.nokeyerr);
} else {
robj *o = dictGetEntryVal(de);
if (o->type != REDIS_LIST) {
addReply(c,shared.wrongtypeerr);
} else {
list *list = o->ptr;
listNode *ln;
int llen = listLength(list);
int j, ltrim, rtrim;
/* convert negative indexes */
if (start < 0) start = llen+start;
if (end < 0) end = llen+end;
if (start < 0) start = 0;
if (end < 0) end = 0;
/* indexes sanity checks */
if (start > end || start >= llen) {
/* Out of range start or start > end result in empty list */
ltrim = llen;
rtrim = 0;
} else {
if (end >= llen) end = llen-1;
ltrim = start;
rtrim = llen-end-1;
}
/* Remove list elements to perform the trim */
for (j = 0; j < ltrim; j++) {
ln = listFirst(list);
listDelNode(list,ln);
}
for (j = 0; j < rtrim; j++) {
ln = listLast(list);
listDelNode(list,ln);
}
addReply(c,shared.ok);
server.dirty++;
}
}
}
static void lremCommand(redisClient *c) {
dictEntry *de;
de = dictFind(c->dict,c->argv[1]);
if (de == NULL) {
addReply(c,shared.nokeyerr);
} else {
robj *o = dictGetEntryVal(de);
if (o->type != REDIS_LIST) {
addReply(c,shared.wrongtypeerr);
} else {
list *list = o->ptr;
listNode *ln, *next;
int toremove = atoi(c->argv[2]->ptr);
int removed = 0;
int fromtail = 0;
if (toremove < 0) {
toremove = -toremove;
fromtail = 1;
}
ln = fromtail ? list->tail : list->head;
while (ln) {
robj *ele = listNodeValue(ln);
next = fromtail ? ln->prev : ln->next;
if (sdscmp(ele->ptr,c->argv[3]->ptr) == 0) {
listDelNode(list,ln);
server.dirty++;
removed++;
if (toremove && removed == toremove) break;
}
ln = next;
}
addReplySds(c,sdscatprintf(sdsempty(),":%d\r\n",removed));
}
}
}
/* ==================================== Sets ================================ */
static void saddCommand(redisClient *c) {
dictEntry *de;
robj *set;
de = dictFind(c->dict,c->argv[1]);
if (de == NULL) {
set = createSetObject();
dictAdd(c->dict,c->argv[1],set);
incrRefCount(c->argv[1]);
} else {
set = dictGetEntryVal(de);
if (set->type != REDIS_SET) {
addReply(c,shared.wrongtypeerr);
return;
}
}
if (dictAdd(set->ptr,c->argv[2],NULL) == DICT_OK) {
incrRefCount(c->argv[2]);
server.dirty++;
addReply(c,shared.cone);
} else {
addReply(c,shared.czero);
}
}
static void sremCommand(redisClient *c) {
dictEntry *de;
de = dictFind(c->dict,c->argv[1]);
if (de == NULL) {
addReply(c,shared.czero);
} else {
robj *set;
set = dictGetEntryVal(de);
if (set->type != REDIS_SET) {
addReply(c,shared.wrongtypeerr);
return;
}
if (dictDelete(set->ptr,c->argv[2]) == DICT_OK) {
server.dirty++;
addReply(c,shared.cone);
} else {
addReply(c,shared.czero);
}
}
}
static void sismemberCommand(redisClient *c) {
dictEntry *de;
de = dictFind(c->dict,c->argv[1]);
if (de == NULL) {
addReply(c,shared.czero);
} else {
robj *set;
set = dictGetEntryVal(de);
if (set->type != REDIS_SET) {
addReply(c,shared.wrongtypeerr);
return;
}
if (dictFind(set->ptr,c->argv[2]))
addReply(c,shared.cone);
else
addReply(c,shared.czero);
}
}
static void scardCommand(redisClient *c) {
dictEntry *de;
dict *s;
de = dictFind(c->dict,c->argv[1]);
if (de == NULL) {
addReply(c,shared.czero);
return;
} else {
robj *o = dictGetEntryVal(de);
if (o->type != REDIS_SET) {
addReply(c,shared.wrongtypeerr);
} else {
s = o->ptr;
addReplySds(c,sdscatprintf(sdsempty(),":%d\r\n",
dictGetHashTableUsed(s)));
}
}
}
static int qsortCompareSetsByCardinality(const void *s1, const void *s2) {
dict **d1 = (void*) s1, **d2 = (void*) s2;
return dictGetHashTableUsed(*d1)-dictGetHashTableUsed(*d2);
}
static void sinterGenericCommand(redisClient *c, robj **setskeys, int setsnum, robj *dstkey) {
dict **dv = zmalloc(sizeof(dict*)*setsnum);
dictIterator *di;
dictEntry *de;
robj *lenobj = NULL, *dstset = NULL;
int j, cardinality = 0;
if (!dv) oom("sinterCommand");
for (j = 0; j < setsnum; j++) {
robj *setobj;
dictEntry *de;
de = dictFind(c->dict,setskeys[j]);
if (!de) {
zfree(dv);
addReply(c,shared.nokeyerr);
return;
}
setobj = dictGetEntryVal(de);
if (setobj->type != REDIS_SET) {
zfree(dv);
addReply(c,shared.wrongtypeerr);
return;
}
dv[j] = setobj->ptr;
}
/* Sort sets from the smallest to largest, this will improve our
* algorithm's performace */
qsort(dv,setsnum,sizeof(dict*),qsortCompareSetsByCardinality);
/* The first thing we should output is the total number of elements...
* since this is a multi-bulk write, but at this stage we don't know
* the intersection set size, so we use a trick, append an empty object
* to the output list and save the pointer to later modify it with the
* right length */
if (!dstkey) {
lenobj = createObject(REDIS_STRING,NULL);
addReply(c,lenobj);
decrRefCount(lenobj);
} else {
/* If we have a target key where to store the resulting set
* create this key with an empty set inside */
dstset = createSetObject();
dictDelete(c->dict,dstkey);
dictAdd(c->dict,dstkey,dstset);
incrRefCount(dstkey);
}
/* Iterate all the elements of the first (smallest) set, and test
* the element against all the other sets, if at least one set does
* not include the element it is discarded */
di = dictGetIterator(dv[0]);
if (!di) oom("dictGetIterator");
while((de = dictNext(di)) != NULL) {
robj *ele;
for (j = 1; j < setsnum; j++)
if (dictFind(dv[j],dictGetEntryKey(de)) == NULL) break;
if (j != setsnum)
continue; /* at least one set does not contain the member */
ele = dictGetEntryKey(de);
if (!dstkey) {
addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n",sdslen(ele->ptr)));
addReply(c,ele);
addReply(c,shared.crlf);
cardinality++;
} else {
dictAdd(dstset->ptr,ele,NULL);
incrRefCount(ele);
}
}
dictReleaseIterator(di);
if (!dstkey)
lenobj->ptr = sdscatprintf(sdsempty(),"*%d\r\n",cardinality);
else
addReply(c,shared.ok);
zfree(dv);
}
static void sinterCommand(redisClient *c) {
sinterGenericCommand(c,c->argv+1,c->argc-1,NULL);
}
static void sinterstoreCommand(redisClient *c) {
sinterGenericCommand(c,c->argv+2,c->argc-2,c->argv[1]);
}
static void flushdbCommand(redisClient *c) {
dictEmpty(c->dict);
addReply(c,shared.ok);
rdbSave(server.dbfilename);
}
static void flushallCommand(redisClient *c) {
emptyDb();
addReply(c,shared.ok);
rdbSave(server.dbfilename);
}
redisSortOperation *createSortOperation(int type, robj *pattern) {
redisSortOperation *so = zmalloc(sizeof(*so));
if (!so) oom("createSortOperation");
so->type = type;
so->pattern = pattern;
return so;
}
/* Return the value associated to the key with a name obtained
* substituting the first occurence of '*' in 'pattern' with 'subst' */
robj *lookupKeyByPattern(dict *dict, robj *pattern, robj *subst) {
char *p;
sds spat, ssub;
robj keyobj;
int prefixlen, sublen, postfixlen;
dictEntry *de;
/* Expoit the internal sds representation to create a sds string allocated on the stack in order to make this function faster */
struct {
long len;
long free;
char buf[REDIS_SORTKEY_MAX+1];
} keyname;
spat = pattern->ptr;
ssub = subst->ptr;
if (sdslen(spat)+sdslen(ssub)-1 > REDIS_SORTKEY_MAX) return NULL;
p = strchr(spat,'*');
if (!p) return NULL;
prefixlen = p-spat;
sublen = sdslen(ssub);
postfixlen = sdslen(spat)-(prefixlen+1);
memcpy(keyname.buf,spat,prefixlen);
memcpy(keyname.buf+prefixlen,ssub,sublen);
memcpy(keyname.buf+prefixlen+sublen,p+1,postfixlen);
keyname.buf[prefixlen+sublen+postfixlen] = '\0';
keyname.len = prefixlen+sublen+postfixlen;
keyobj.refcount = 1;
keyobj.type = REDIS_STRING;
keyobj.ptr = ((char*)&keyname)+(sizeof(long)*2);
de = dictFind(dict,&keyobj);
/* printf("lookup '%s' => %p\n", keyname.buf,de); */
if (!de) return NULL;
return dictGetEntryVal(de);
}
/* sortCompare() is used by qsort in sortCommand(). Given that qsort_r with
* the additional parameter is not standard but a BSD-specific we have to
* pass sorting parameters via the global 'server' structure */
static int sortCompare(const void *s1, const void *s2) {
const redisSortObject *so1 = s1, *so2 = s2;
int cmp;
if (!server.sort_alpha) {
/* Numeric sorting. Here it's trivial as we precomputed scores */
if (so1->u.score > so2->u.score) {
cmp = 1;
} else if (so1->u.score < so2->u.score) {
cmp = -1;
} else {
cmp = 0;
}
} else {
/* Alphanumeric sorting */
if (server.sort_bypattern) {
if (!so1->u.cmpobj || !so2->u.cmpobj) {
/* At least one compare object is NULL */
if (so1->u.cmpobj == so2->u.cmpobj)
cmp = 0;
else if (so1->u.cmpobj == NULL)
cmp = -1;
else
cmp = 1;
} else {
/* We have both the objects, use strcoll */
cmp = strcoll(so1->u.cmpobj->ptr,so2->u.cmpobj->ptr);
}
} else {
/* Compare elements directly */
cmp = strcoll(so1->obj->ptr,so2->obj->ptr);
}
}
return server.sort_desc ? -cmp : cmp;
}
/* The SORT command is the most complex command in Redis. Warning: this code
* is optimized for speed and a bit less for readability */
static void sortCommand(redisClient *c) {
dictEntry *de;
list *operations;
int outputlen = 0;
int desc = 0, alpha = 0;
int limit_start = 0, limit_count = -1, start, end;
int j, dontsort = 0, vectorlen;
int getop = 0; /* GET operation counter */
robj *sortval, *sortby = NULL;
redisSortObject *vector; /* Resulting vector to sort */
/* Lookup the key to sort. It must be of the right types */
de = dictFind(c->dict,c->argv[1]);
if (de == NULL) {
addReply(c,shared.nokeyerr);
return;
}
sortval = dictGetEntryVal(de);
if (sortval->type != REDIS_SET && sortval->type != REDIS_LIST) {
addReply(c,shared.wrongtypeerr);
return;
}
/* Create a list of operations to perform for every sorted element.
* Operations can be GET/DEL/INCR/DECR */
operations = listCreate();
listSetFreeMethod(operations,zfree);
j = 2;
/* Now we need to protect sortval incrementing its count, in the future
* SORT may have options able to overwrite/delete keys during the sorting
* and the sorted key itself may get destroied */
incrRefCount(sortval);
/* The SORT command has an SQL-alike syntax, parse it */
while(j < c->argc) {
int leftargs = c->argc-j-1;
if (!strcasecmp(c->argv[j]->ptr,"asc")) {
desc = 0;
} else if (!strcasecmp(c->argv[j]->ptr,"desc")) {
desc = 1;
} else if (!strcasecmp(c->argv[j]->ptr,"alpha")) {
alpha = 1;
} else if (!strcasecmp(c->argv[j]->ptr,"limit") && leftargs >= 2) {
limit_start = atoi(c->argv[j+1]->ptr);
limit_count = atoi(c->argv[j+2]->ptr);
j+=2;
} else if (!strcasecmp(c->argv[j]->ptr,"by") && leftargs >= 1) {
sortby = c->argv[j+1];
/* If the BY pattern does not contain '*', i.e. it is constant,
* we don't need to sort nor to lookup the weight keys. */
if (strchr(c->argv[j+1]->ptr,'*') == NULL) dontsort = 1;
j++;
} else if (!strcasecmp(c->argv[j]->ptr,"get") && leftargs >= 1) {
listAddNodeTail(operations,createSortOperation(
REDIS_SORT_GET,c->argv[j+1]));
getop++;
j++;
} else if (!strcasecmp(c->argv[j]->ptr,"del") && leftargs >= 1) {
listAddNodeTail(operations,createSortOperation(
REDIS_SORT_DEL,c->argv[j+1]));
j++;
} else if (!strcasecmp(c->argv[j]->ptr,"incr") && leftargs >= 1) {
listAddNodeTail(operations,createSortOperation(
REDIS_SORT_INCR,c->argv[j+1]));
j++;
} else if (!strcasecmp(c->argv[j]->ptr,"get") && leftargs >= 1) {
listAddNodeTail(operations,createSortOperation(
REDIS_SORT_DECR,c->argv[j+1]));
j++;
} else {
decrRefCount(sortval);
listRelease(operations);
addReply(c,shared.syntaxerr);
return;
}
j++;
}
/* Load the sorting vector with all the objects to sort */
vectorlen = (sortval->type == REDIS_LIST) ?
listLength((list*)sortval->ptr) :
dictGetHashTableUsed((dict*)sortval->ptr);
vector = zmalloc(sizeof(redisSortObject)*vectorlen);
if (!vector) oom("allocating objects vector for SORT");
j = 0;
if (sortval->type == REDIS_LIST) {
list *list = sortval->ptr;
listNode *ln = list->head;
while(ln) {
robj *ele = ln->value;
vector[j].obj = ele;
vector[j].u.score = 0;
vector[j].u.cmpobj = NULL;
ln = ln->next;
j++;
}
} else {
dict *set = sortval->ptr;
dictIterator *di;
dictEntry *setele;
di = dictGetIterator(set);
if (!di) oom("dictGetIterator");
while((setele = dictNext(di)) != NULL) {
vector[j].obj = dictGetEntryKey(setele);
vector[j].u.score = 0;
vector[j].u.cmpobj = NULL;
j++;
}
dictReleaseIterator(di);
}
assert(j == vectorlen);
/* Now it's time to load the right scores in the sorting vector */
if (dontsort == 0) {
for (j = 0; j < vectorlen; j++) {
if (sortby) {
robj *byval;
byval = lookupKeyByPattern(c->dict,sortby,vector[j].obj);
if (!byval || byval->type != REDIS_STRING) continue;
if (alpha) {
vector[j].u.cmpobj = byval;
incrRefCount(byval);
} else {
vector[j].u.score = strtod(byval->ptr,NULL);
}
} else {
if (!alpha) vector[j].u.score = strtod(vector[j].obj->ptr,NULL);
}
}
}
/* We are ready to sort the vector... perform a bit of sanity check
* on the LIMIT option too. We'll use a partial version of quicksort. */
start = (limit_start < 0) ? 0 : limit_start;
end = (limit_count < 0) ? vectorlen-1 : start+limit_count-1;
if (start >= vectorlen) {
start = vectorlen-1;
end = vectorlen-2;
}
if (end >= vectorlen) end = vectorlen-1;
if (dontsort == 0) {
server.sort_desc = desc;
server.sort_alpha = alpha;
server.sort_bypattern = sortby ? 1 : 0;
qsort(vector,vectorlen,sizeof(redisSortObject),sortCompare);
}
/* Send command output to the output buffer, performing the specified
* GET/DEL/INCR/DECR operations if any. */
outputlen = getop ? getop*(end-start+1) : end-start+1;
addReplySds(c,sdscatprintf(sdsempty(),"*%d\r\n",outputlen));
for (j = start; j <= end; j++) {
listNode *ln = operations->head;
if (!getop) {
addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n",
sdslen(vector[j].obj->ptr)));
addReply(c,vector[j].obj);
addReply(c,shared.crlf);
}
while(ln) {
redisSortOperation *sop = ln->value;
robj *val = lookupKeyByPattern(c->dict,sop->pattern,
vector[j].obj);
if (sop->type == REDIS_SORT_GET) {
if (!val || val->type != REDIS_STRING) {
addReply(c,shared.nullbulk);
} else {
addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n",
sdslen(val->ptr)));
addReply(c,val);
addReply(c,shared.crlf);
}
} else if (sop->type == REDIS_SORT_DEL) {
/* TODO */
}
ln = ln->next;
}
}
/* Cleanup */
decrRefCount(sortval);
listRelease(operations);
for (j = 0; j < vectorlen; j++) {
if (sortby && alpha && vector[j].u.cmpobj)
decrRefCount(vector[j].u.cmpobj);
}
zfree(vector);
}
static void infoCommand(redisClient *c) {
sds info;
time_t uptime = time(NULL)-server.stat_starttime;
info = sdscatprintf(sdsempty(),
"redis_version:%s\r\n"
"connected_clients:%d\r\n"
"connected_slaves:%d\r\n"
"used_memory:%d\r\n"
"changes_since_last_save:%lld\r\n"
"last_save_time:%d\r\n"
"total_connections_received:%lld\r\n"
"total_commands_processed:%lld\r\n"
"uptime_in_seconds:%d\r\n"
"uptime_in_days:%d\r\n"
,REDIS_VERSION,
listLength(server.clients)-listLength(server.slaves),
listLength(server.slaves),
server.usedmemory,
server.dirty,
server.lastsave,
server.stat_numconnections,
server.stat_numcommands,
uptime,
uptime/(3600*24)
);
addReplySds(c,sdscatprintf(sdsempty(),"$%d\r\n",sdslen(info)));
addReplySds(c,info);
addReply(c,shared.crlf);
}
/* =============================== Replication ============================= */
/* Send the whole output buffer syncronously to the slave. This a general operation in theory, but it is actually useful only for replication. */
static int flushClientOutput(redisClient *c) {
int retval;
time_t start = time(NULL);
while(listLength(c->reply)) {
if (time(NULL)-start > 5) return REDIS_ERR; /* 5 seconds timeout */
retval = aeWait(c->fd,AE_WRITABLE,1000);
if (retval == -1) {
return REDIS_ERR;
} else if (retval & AE_WRITABLE) {
sendReplyToClient(NULL, c->fd, c, AE_WRITABLE);
}
}
return REDIS_OK;
}
static int syncWrite(int fd, char *ptr, ssize_t size, int timeout) {
ssize_t nwritten, ret = size;
time_t start = time(NULL);
timeout++;
while(size) {
if (aeWait(fd,AE_WRITABLE,1000) & AE_WRITABLE) {
nwritten = write(fd,ptr,size);
if (nwritten == -1) return -1;
ptr += nwritten;
size -= nwritten;
}
if ((time(NULL)-start) > timeout) {
errno = ETIMEDOUT;
return -1;
}
}
return ret;
}
static int syncRead(int fd, char *ptr, ssize_t size, int timeout) {
ssize_t nread, totread = 0;
time_t start = time(NULL);
timeout++;
while(size) {
if (aeWait(fd,AE_READABLE,1000) & AE_READABLE) {
nread = read(fd,ptr,size);
if (nread == -1) return -1;
ptr += nread;
size -= nread;
totread += nread;
}
if ((time(NULL)-start) > timeout) {
errno = ETIMEDOUT;
return -1;
}
}
return totread;
}
static int syncReadLine(int fd, char *ptr, ssize_t size, int timeout) {
ssize_t nread = 0;
size--;
while(size) {
char c;
if (syncRead(fd,&c,1,timeout) == -1) return -1;
if (c == '\n') {
*ptr = '\0';
if (nread && *(ptr-1) == '\r') *(ptr-1) = '\0';
return nread;
} else {
*ptr++ = c;
*ptr = '\0';
nread++;
}
}
return nread;
}
static void syncCommand(redisClient *c) {
struct stat sb;
int fd = -1, len;
time_t start = time(NULL);
char sizebuf[32];
/* ignore SYNC if aleady slave or in monitor mode */
if (c->flags & REDIS_SLAVE) return;
redisLog(REDIS_NOTICE,"Slave ask for syncronization");
if (flushClientOutput(c) == REDIS_ERR ||
rdbSave(server.dbfilename) != REDIS_OK)
goto closeconn;
fd = open(server.dbfilename, O_RDONLY);
if (fd == -1 || fstat(fd,&sb) == -1) goto closeconn;
len = sb.st_size;
snprintf(sizebuf,32,"$%d\r\n",len);
if (syncWrite(c->fd,sizebuf,strlen(sizebuf),5) == -1) goto closeconn;
while(len) {
char buf[1024];
int nread;
if (time(NULL)-start > REDIS_MAX_SYNC_TIME) goto closeconn;
nread = read(fd,buf,1024);
if (nread == -1) goto closeconn;
len -= nread;
if (syncWrite(c->fd,buf,nread,5) == -1) goto closeconn;
}
if (syncWrite(c->fd,"\r\n",2,5) == -1) goto closeconn;
close(fd);
c->flags |= REDIS_SLAVE;
c->slaveseldb = 0;
if (!listAddNodeTail(server.slaves,c)) oom("listAddNodeTail");
redisLog(REDIS_NOTICE,"Syncronization with slave succeeded");
return;
closeconn:
if (fd != -1) close(fd);
c->flags |= REDIS_CLOSE;
redisLog(REDIS_WARNING,"Syncronization with slave failed");
return;
}
static int syncWithMaster(void) {
char buf[1024], tmpfile[256];
int dumpsize;
int fd = anetTcpConnect(NULL,server.masterhost,server.masterport);
int dfd;
if (fd == -1) {
redisLog(REDIS_WARNING,"Unable to connect to MASTER: %s",
strerror(errno));
return REDIS_ERR;
}
/* Issue the SYNC command */
if (syncWrite(fd,"SYNC \r\n",7,5) == -1) {
close(fd);
redisLog(REDIS_WARNING,"I/O error writing to MASTER: %s",
strerror(errno));
return REDIS_ERR;
}
/* Read the bulk write count */
if (syncReadLine(fd,buf,1024,5) == -1) {
close(fd);
redisLog(REDIS_WARNING,"I/O error reading bulk count from MASTER: %s",
strerror(errno));
return REDIS_ERR;
}
dumpsize = atoi(buf+1);
redisLog(REDIS_NOTICE,"Receiving %d bytes data dump from MASTER",dumpsize);
/* Read the bulk write data on a temp file */
snprintf(tmpfile,256,"temp-%d.%ld.rdb",(int)time(NULL),(long int)random());
dfd = open(tmpfile,O_CREAT|O_WRONLY,0644);
if (dfd == -1) {
close(fd);
redisLog(REDIS_WARNING,"Opening the temp file needed for MASTER <-> SLAVE synchronization: %s",strerror(errno));
return REDIS_ERR;
}
while(dumpsize) {
int nread, nwritten;
nread = read(fd,buf,(dumpsize < 1024)?dumpsize:1024);
if (nread == -1) {
redisLog(REDIS_WARNING,"I/O error trying to sync with MASTER: %s",
strerror(errno));
close(fd);
close(dfd);
return REDIS_ERR;
}
nwritten = write(dfd,buf,nread);
if (nwritten == -1) {
redisLog(REDIS_WARNING,"Write error writing to the DB dump file needed for MASTER <-> SLAVE synchrnonization: %s", strerror(errno));
close(fd);
close(dfd);
return REDIS_ERR;
}
dumpsize -= nread;
}
close(dfd);
if (rename(tmpfile,server.dbfilename) == -1) {
redisLog(REDIS_WARNING,"Failed trying to rename the temp DB into dump.rdb in MASTER <-> SLAVE synchronization: %s", strerror(errno));
unlink(tmpfile);
close(fd);
return REDIS_ERR;
}
emptyDb();
if (rdbLoad(server.dbfilename) != REDIS_OK) {
redisLog(REDIS_WARNING,"Failed trying to load the MASTER synchronization DB from disk");
close(fd);
return REDIS_ERR;
}
server.master = createClient(fd);
server.master->flags |= REDIS_MASTER;
server.replstate = REDIS_REPL_CONNECTED;
return REDIS_OK;
}
static void monitorCommand(redisClient *c) {
/* ignore MONITOR if aleady slave or in monitor mode */
if (c->flags & REDIS_SLAVE) return;
c->flags |= (REDIS_SLAVE|REDIS_MONITOR);
c->slaveseldb = 0;
if (!listAddNodeTail(server.monitors,c)) oom("listAddNodeTail");
addReply(c,shared.ok);
}
/* =================================== Main! ================================ */
static void daemonize(void) {
int fd;
FILE *fp;
if (fork() != 0) exit(0); /* parent exits */
setsid(); /* create a new session */
/* Every output goes to /dev/null. If Redis is daemonized but
* the 'logfile' is set to 'stdout' in the configuration file
* it will not log at all. */
if ((fd = open("/dev/null", O_RDWR, 0)) != -1) {
dup2(fd, STDIN_FILENO);
dup2(fd, STDOUT_FILENO);
dup2(fd, STDERR_FILENO);
if (fd > STDERR_FILENO) close(fd);
}
/* Try to write the pid file */
fp = fopen(server.pidfile,"w");
if (fp) {
fprintf(fp,"%d\n",getpid());
fclose(fp);
}
}
int main(int argc, char **argv) {
initServerConfig();
if (argc == 2) {
ResetServerSaveParams();
loadServerConfig(argv[1]);
} else if (argc > 2) {
fprintf(stderr,"Usage: ./redis-server [/path/to/redis.conf]\n");
exit(1);
}
initServer();
if (server.daemonize) daemonize();
redisLog(REDIS_NOTICE,"Server started, Redis version " REDIS_VERSION);
if (rdbLoad(server.dbfilename) == REDIS_OK)
redisLog(REDIS_NOTICE,"DB loaded from disk");
if (aeCreateFileEvent(server.el, server.fd, AE_READABLE,
acceptHandler, NULL, NULL) == AE_ERR) oom("creating file event");
redisLog(REDIS_NOTICE,"The server is now ready to accept connections on port %d", server.port);
aeMain(server.el);
aeDeleteEventLoop(server.el);
return 0;
}